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The constant body temperature found in Aves is a characteristic referred to as:
The NCERT text states: 'They are warm-blooded (homoiothermous) animals, i.e., they are able to maintain a constant body temperature.' Homoiothermous organisms can regulate their internal temperature independently of the external environment.
In Aves, the digestive tract includes additional chambers for processing food. These are:
The NCERT text mentions: 'The digestive tract of birds has additional chambers, the crop and gizzard.' The crop stores food, and the gizzard grinds it.
What is the primary modification of forelimbs in Aves?
The NCERT text states: 'The forelimbs are modified into wings.' This is a key adaptation for aerial locomotion in birds.
Which of the following distinguishing features is characteristic of Aves?
The NCERT text highlights: 'The characteristic features of Aves (birds) are the presence of feathers and most of them can fly except flightless birds (e.g., Ostrich).' Feathers are unique to birds and essential for flight and insulation.
The heart of Aves is characterized by having:
The NCERT text states: 'Heart is completely four-chambered.' A four-chambered heart ensures complete separation of oxygenated and deoxygenated blood, which is crucial for maintaining a high metabolic rate in warm-blooded animals.
In Aves, where is the oil gland typically located?
The NCERT text mentions: 'Skin is dry without glands except the oil gland at the base of the tail.' This gland produces oil for preening and waterproofing feathers.
All vertebrates are chordates because:
The NCERT text clarifies: 'The members of subphylum Vertebrata possess notochord during the embryonic period. The notochord is replaced by a cartilaginous or bony vertebral column in the adult. Thus all vertebrates are chordates but all chordates are not vertebrates.' This explains the hierarchical relationship.
Which of the following is true regarding the presence of scales in Aves?
The NCERT text notes: 'The hind limbs generally have scales and are modified for walking, swimming or clasping the tree branches.' While feathers cover most of the body, scales are a characteristic feature of their hind limbs.
The term 'homoiothermous' implies that Aves:
The NCERT text defines homoiothermous as 'i.e., they are able to maintain a constant body temperature.'
Which feature is unique to mammals and not found in Aves?
While Aves are warm-blooded and have a four-chambered heart, the text states 'The unique features of mammals are the presence of mammary glands and hairs on the skin.' These are not present in Aves.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.